Through observation, Ⅰ researched the effectiveness of aerobic exercise towards the reduction of accumulative fat among the obese. Ⅰ devided the subjects into two groups: Group 1 was put on a diet program that included aerobic exercise. Group 2, the comparison group, was strictly put on a dietary weight loss program that did not include any exercise. Group 1 practiced continuous aerobic exercise which included walking, jogging, and bicycling. The 45-60 minute programs included warm-up exercise as well as regimental exercise. The frequency of exercising was 3 to 5 times per week over a period of 2 months. The reaserch results showed an average accumulative fat reduction ratio of 5.356% among the experimental group that was put under a diet and exercise program. The comparison group (diet only) showed a fat reduction ratio of just 0.709%. Furthermore, the experimental group showed an average weight loss of 6.23kg from accumulative fat quantity reduction, while the comparison group showed an average loss of just 1.068%. In view of the results so far achieved, Ⅰ support ASDA`s(1978) Report. I agree continuous cardiovascular exercise reduces the accumulation of fat and obesity. The best way to fitness is to carry out maximum oxygen intake of 60% intensity more than 20 minutes 3 times a week.